The formule is about area of a circle.

We need to solve the equation for x. Where x is the radius of the circle.
In order to solve it for x, we need isolate it for x on left side.
So, first we need to get rid pi from left side.
On dividing both sides by pi, we get


Taking square root on both sides, we get


278. I got It By Counting The Letters On Meh Keyboard As Many Times As The #'s On My Keyboard.
5-7+15-(-1)
-2+15+1 -2+15 =13 13+1 Answer is 14
Percent means per one-hundred...
(40/100)*(80/100)=3200/10000=32/100=32%